The presentation is functional but somewhat barebones on the whole; the backgrounds and music choices are inoffensive, and all the other stuff is mostly just the Ren'py defaults. While the engine does deserve some of the blame, not having the option to choose the language at startup is a pretty painful UX papercut – I really recommend looking into a better way to do it, since you're in the business of releasing dual-language VNs. Some more nitpicks: transitioning instantly back to the titlescreen from the last line is somewhat of a mood-killer, and the title is cut off in the Itch thumbnail.
As for the writing, it's sharp and comes with a clear voice. After having playing that VN, it's fun to spot the NeveN-isms – all the short, witty comments with exclamation marks remind me of Erik's narrative voice. There's a lot of fun character writing in the beginning, and I also like how the game is patient enough to revel in the mundanity for so long that the genre shift really lands. I wonder, though, if having stronger foreshadowing would have made the juxtaposition feel stronger (at the cost of some surprise, I guess).
Overall, I do get the sense that the game could have been slightly more formally adventurous and stronger with its imagery; how the backstory is ultimately revealed, for instance, is not particularly interesting or effective. Just would have been nice to get the chaos and the excitement of the finale get reflected in the form and the prose as well, you know? The poem is well-written and a really nice touch, though, especially as such a stark tonal break. I'd probably call that the best moment of the game, even if I maybe feel like there could have been something in the visuals or the audio to really underscore it.
Anyway, all in all, Blazing Passion is an enjoyable read; my congratulations to the NeveN team for delivering yet another solid MAY WOLF entry.